The T-tubular membrane contains ________ receptors that are ________ and therefore respond to action potentials. This receptor is mechanically linked to ________ receptors in the adjacent sarcoplasmic reticulum.
What will be an ideal response?
dihydropyridine (DHP) or L-type calcium channel, voltage -sensing, ryanodine (RyR) or calcium release channel
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Dual innervation means that an individual effector
A. may be excited or inhibited by a single division of the autonomic nervous system. B. receives input from both the somatic and the autonomic nervous systems. C. receives input from both the sympathetic and the parasympathetic nervous systems. D. receives two autonomic axons on each smooth muscle cell.
The absolute refractory period of an action potential
A) ensures one-way travel down an axon and allows a neuron to ignore a second signal sent that closely follows the first. B) only allows a neuron to ignore a second signal sent that closely follows the first. C) only ensures one -way travel down an axon. D) only prevents summation of action potentials. E) ensures one-way travel down an axon, allows a neuron to ignore a second signal sent that closely follows the first, and prevents summation of action potentials.
One division of the autonomic nervous system stimulates your salivary glands to secrete a watery solution of enzymes, and the other division stimulates them to secrete mucus. Together, these secretions constitute the saliva. This is an example of which of the following?
A. An antagonistic effect B. A biofeedback effect C. A sympathetic effect D. A cooperative effect E. A dual effect
The blockage of CSF inside the brain is a condition called ________.
A. ventricular hydrocephalus B. internal hematoma C. internal hydrocephalus D. external hydrocephalus